HAKOBYAN, Davit; HAMDI, Maher; REDON, Olivier; BALLESTERO, Anthony; MAYAUDON, Alexis; BOYER, Laurence; DURAND, Olivier; ABRAHAM, Emmanuel

doi:10.1016/j.jeurceramsoc.2021.10.026

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

HAKOBYAN, Davit
Direction de Recherche Technologique (CEA) [DRT (CEA)]

HAMDI, Maher
Direction de Recherche Technologique (CEA) [DRT (CEA)]

REDON, Olivier
Direction de Recherche Technologique (CEA) [DRT (CEA)]

Langue

Article de revue

Ce document a été publié dans

Journal of the European Ceramic Society. 2022, vol. 42, n° 2, p. 525-533

Elsevier

Résumé en anglais

Dielectric constants of Al 2 O 3 (alumina) ceramic samples have been measured with non-destructive terahertz time-domain spectroscopy. Using an effective medium approximation, we demonstrated that the relative permittivity can be used to evaluate the porous alumina samples, with porosity fractions ranging from 0% to 20% per volume. This result makes it possible to control sample porosity, a key material parameter related to mechanical strength under compression load, hardness and wear resistance, or thermal stability. We also employed terahertz time-domain spectroscopy to differentiate alumina samples fabricated with different grain sizes, or reveal a small fraction of impurities, such as 5% vol of ZrO 2 , embedded in non-porous alumina. These results demonstrated the potential of terahertz radiation for non-destructive characterization of low loss high dielectric constant ceramics.< Réduire

Mots clés en anglais

Porosity evaluation

aluminum oxide Al 2 O 3

ceramics

non-destructive evaluation

dielectric properties

terahertz time-domain spectroscopy

Métadonnées

Licence d’utilisation du document

Non-destructive evaluation of ceramic porosity using terahertz time-domain spectroscopy

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

DOI

Origine

Unités de recherche